sys_util: timerfd: Methods don't need to me mut

Because TimerFd is a wrapper around a 'File' that is never modified
there isn't a need for a mutable borrow. The kernel already handles the
interior mutability of the underlying file descriptor.

Change-Id: I7ae068cc54050b0021d00620b561335b2ae0ba16
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2161625
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
Tested-by: Dylan Reid <dgreid@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Dylan Reid <dgreid@chromium.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/linux.rs b/src/linux.rs
index 8690ff7..c8eb478 100644
--- a/src/linux.rs
+++ b/src/linux.rs
@@ -1767,7 +1767,7 @@ fn run_control(
     }
 
     // Balance available memory between guest and host every second.
-    let mut balancemem_timer = TimerFd::new().map_err(Error::CreateTimerFd)?;
+    let balancemem_timer = TimerFd::new().map_err(Error::CreateTimerFd)?;
     if Path::new(LOWMEM_AVAILABLE).exists() {
         // Create timer request balloon stats every 1s.
         poll_ctx